This monumental compendium of 1,744 pages (folio) dealing with the application of physics in medicine is really a small encyclopedia. Alphabetically arranged there are hundreds of brief articles dealing with all sorts of subjects. Thus if one opens at random one comes across "Massage," "Mathematical Biophysics," "Matter: Structure," "Metabolism: Apparatus" and "Methods." A series of articles on "Roentgenography" runs from page 1262 to 1330, to be followed by 70 pages on "Roentgen Rays." Then comes "Shock," "Sound," etc. The articles are concise, written by well known authorities and plentifully illustrated with photographs, charts and tables. There are adequate indexes, and the material is easy to find. One is impressed by the need of just this sort of reference book.